/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.net.ftp;

import java.io.BufferedReader;
import java.io.IOException;
import java.util.List;

/**
 * This abstract class implements both the older FTPFileListParser and newer FTPFileEntryParser interfaces with default functionality. All the classes in the
 * parser subpackage inherit from this.
 */
public abstract class FTPFileEntryParserImpl implements FTPFileEntryParser {

    /**
     * The constructor for a FTPFileEntryParserImpl object.
     */
    public FTPFileEntryParserImpl() {
    }

    /**
     * This method is a hook for those implementors (such as VMSVersioningFTPEntryParser, and possibly others) which need to perform some action upon the
     * FTPFileList after it has been created from the server stream, but before any clients see the list.
     *
     * This default implementation does nothing.
     *
     * @param original Original list after it has been created from the server stream
     * @return {@code original} unmodified.
     */
    @Override
    public List<String> preParse(final List<String> original) {
        return original;
    }

    /**
     * Reads the next entry using the supplied BufferedReader object up to whatever delimits one entry from the next. This default implementation simply calls
     * BufferedReader.readLine().
     *
     * @param reader The BufferedReader object from which entries are to be read.
     * @return A string representing the next ftp entry or null if none found.
     * @throws IOException thrown on any IO Error reading from the reader.
     */
    @Override
    public String readNextEntry(final BufferedReader reader) throws IOException {
        return reader.readLine();
    }
}
